Hi, another question. The spec says that groups are interfaces, but it is not specific about what happens if non interface classes are passed to validate: /** * Validates all constraints on object. * * @param object object to validate * @param groups groups targeted for validation * (default to {@link javax.validation.groups.Default}) * * @return constraint violations or an empty Set if none * * @throws IllegalArgumentException if object is null * @throws ValidationException if a non recoverable error happens * during the validation process */ <T> Set<ConstraintViolation<T>> validate(T object, Class<?>... groups); Should an IllegalArgumentException be thrown if the class is not an interface?

Related to this: "Since sequences cannot have circular dependencies, using Default in the declaration of a sequence is not an op- tion. Constraints hosted on a class A and belonging to the Default group (by default or explicitly) implicitly belong to the group A." Does this imply I should be able to call Validator.validate(aInstance, A.class)? That would violate the statement that groups are interfaces. Is group A just a "conceptual" group?

--Hardy